Originally Posted by Seraphine
A book by a Countess of Brühl (noblesse oblige) it's said that noble women who marry commoner loose their noble status for the time of the marrriage and are cut out of the family (if the family is still very traditional). So may be his sisters didn't want to face that - esp. because the eldest sister of the Prince don't seem to be integrated in the family (married noble, but divorced and remarried a commoner).
There was this one docu about aristo women and their hunt for aristo men, because like you said, they will lose their status if they marry "below" them. Quite sad, but on the other side, we live in post-monarchy Germany...
If the Isenburg parents are really that way, well, I´m glad that Victor gave a hoot.